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Python argparse mutual exclusive group
...')
parser_b.add_argument('-c', type=str, action='store', default='', help='test')
Test it
>>> parser.print_help()
usage: PROG [-h] [--foo] {command_1,command_2} ...
positional arguments:
{command_1,command_2}
help for subcommand
command_1 command_...
Is there a cross-browser onload event when clicking the back button?
...Query adds an onunload event listener.
// http://code.jquery.com/jquery-latest.js
jQuery(window).bind("unload", function() { // ...
By default, it does nothing. But somehow this seems to trigger a reload in Safari, Opera and Mozilla -- no matter what the event handler contains.
[edit(Nickolay): ...
How can I prevent Visual Studio 2013 from closing my IIS Express app when I end debugging?
...
Edit and Continue is useful when debugging and testing web projects. That *.aspx files can be edited, the browser refreshed, and changes will appear. It's not so useful for non-web code...
– Zarepheth
Jul 9 '15 at 21:11
...
Programmatically trigger “select file” dialog box
...
THANK YOU!!!! I've been testing all these answers in the javascript console and I've been going nuts!
– jdkealy
Jan 12 '16 at 17:41
...
One-liner to take some properties from object in ES 6
...e for said function.
Like so:
const orig = {
id: 123456789,
name: 'test',
description: '…',
url: 'https://…',
};
const filtered = ['id', 'name'].reduce((result, key) => { result[key] = orig[key]; return result; }, {});
console.log(filtered); // Object {id: 123456789, name: "test...
How do I write stderr to a file while using “tee” with a pipe?
...understand what you want to do or what the problem is you're having. echo test; exit doesn't produce any output on stdout, so err will remain empty.
– lhunath
Aug 25 '13 at 0:46
1...
How can I check if an ip is in a network in Python?
...x x86. I haven't really given any thought to endianess issues, but I have tested it against the "ipaddr" module using over 200K IP addresses tested against 8 different network strings, and the results of ipaddr are the same as this code.
def addressInNetwork(ip, net):
import socket,struct
ip...
How to find all occurrences of an element in a list?
...have the array, otherwise the cost of converting outweighs the speed gain (tested on integer lists with 100, 1000 and 10000 elements).
NOTE: A note of caution based on Chris_Rands' comment: this solution is faster than the list comprehension if the results are sufficiently sparse, but if the list h...
PHP PDO: charset, set names?
...all three:
<?php
define('DB_HOST', 'localhost');
define('DB_SCHEMA', 'test');
define('DB_USER', 'test');
define('DB_PASSWORD', 'test');
define('DB_ENCODING', 'utf8');
$dsn = 'mysql:host=' . DB_HOST . ';dbname=' . DB_SCHEMA;
$options = array(
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,...
What's the simplest way to test whether a number is a power of 2 in C++?
...s, so must AND to 0 bitwise.
As I was assuming unsigned numbers, the == 0 test (that I originally forgot, sorry) is adequate. You may want a > 0 test if you're using signed integers.
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